body{
    background: -webkit-linear-gradient(top,#bfa,#666);
}
.box {
    position: relative;
    width: 520px;
    height: 280px;
    margin: 100px auto;
}

.box img {
    width: 520px;
    height: 280px;
}

/* 焦点图左右两边箭头制作 */
.prev {
    left: 0;
    border-top-right-radius: 15px;
    border-bottom-right-radius: 15px;
}

.next {
    right: 0;
    border-top-left-radius: 15px;
    border-bottom-left-radius: 15px;

}

.next,
.prev {
    position: absolute;

    top: 50%;
    margin-top: -15px;
    width: 20px;
    height: 30px;
    background-color: rgba(0, 0, 0, .3);
    text-align: center;
    line-height: 30px;
    color: #fff;
    text-decoration: none;
}

.yuandian .changeColor {
    background-color: orange;
}

/* 焦点图圆点制作 */
.yuandian {
    position: absolute;
    bottom: 10px;
    left: 50%;
    margin-left: -35px;
    width: 70px;
    height: 13px;
    border-radius: 25px;
    background: rgba(255, 255, 255, .2)
    
}

.yuandian li {
    float: left;
    width: 8px;
    height: 8px;
    margin: 3px;
    list-style: none;
    background-color: #fff;
    border-radius: 50%;
    z-index: 999;
}